430exam3_spring_2007

430exam3_spring_2007 - Chem_430_Dr. Hogan_s2007_Exam3 1...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Print student name _______________________ Student PID________________________ Pledge_____________________________ Q1. When a mixture of glucose 6-phosphate and fructose 6-phosphate is incubated with the enzyme phosphoglucose isomerase, the final mixture contains twice as much glucose 6- phosphate as fructose 6-phosphate. Based on everything you know about metabolism and glycolysis in particular, which one of the following statements is most likely correct when applied to the reaction below ( R = 8.315 J/mol·K and T = 298 K)? Glucose 6-phosphate fructose 6-phosphate (1) ∆ G' ° is +1.7 kJ/mol. (2) G' ° is –1.7 kJ/mol. (3) G' ° is incalculably large and negative. (4) ∆ G' ° is incalculably large and positive. (5) G' ° is zero. Q2. The steps of glycolysis between glyceraldehyde 3-phosphate and 3-phosphoglycerate involve all of the following except: (1) ATP synthesis. (2)catalysis by phosphoglycerate kinase. (3)oxidation of NADH to NAD + . (4) the formation of 1,3-bisphosphoglycerate. (5) utilization of P i . Q3. The first reaction in glycolysis that results in the formation of an energy-rich compound (i.e., a compound whose hydrolysis has a highly negative G' °) is catalyzed by: (1)glyceraldehyde 3-phosphate dehydrogenase. (2)hexokinase. (3)phosphofructokinase. (4) phosphoglycerate kinase. (5) triose phosphate isomerase. Q4. Inorganic fluoride inhibits enolase. In an anaerobic system that is metabolizing glucose as a substrate, which of the following compounds would you expect to increase in concentration following the addition of fluoride? (1) 2-phosphoglycerate. (2)Glucose. (3)Acetyl CoA. (4)Phosphoenolpyruvate (5) Pyruvate Q5. Which of the following is not true of the reaction catalyzed by the pyruvate dehydrogenase complex? (1)Enzyme E1 catalyzes a reductive decarboxylation. (2)Both NAD + and a flavin nucleotide act as electron carriers. (3)The reaction occurs in the mitochondrial matrix. (4)Substrates are shuttled between enzymes E1 and E3 by the lipoamide function covalently attached to a residue of enzyme E2. (5) Two different cofactors containing —SH groups participate. Q6. Conversion of 1 mol of acetyl-CoA to 2 mol of CO 2 and CoA via the citric acid cycle (i.e., one complete “turn” of the TCA cycle) results in the net production of: (1) 1 mol of citrate. (2) 1 mol of FADH 2 . (3) 1 mol of NADH. (4) 2 mol of oxaloacetate. (5) 7 mol of ATP.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

430exam3_spring_2007 - Chem_430_Dr. Hogan_s2007_Exam3 1...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online